The visibility characteristics and meteorological conditions of a sea fog process on 27</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-fa...The visibility characteristics and meteorological conditions of a sea fog process on 27</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> February, 2016 are analyzed and the heavy fog process is simulated by the Weather Research and Forecasting (WRF) model in this paper. The forecast results show that the visibility in Qingdao coastal area is light fog on the night of the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">. In the WRF simulation, it can be observed from the sea-level pressure that the wind direction of Qingdao and the coastal area turned southerly with the eastward movement of the low pressure system on surface from 1200 UTC to 1800 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">. A large amount of water vapor brought by easterly and southerly wind provides sufficient water vapor conditions for the formation and development of the sea fog. At 975 hPa, there is a strong warm tongue over Shandong Peninsula at 0600 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">, w</span><span><span style="font-family:Verdana;">hile the offshore is affected by the cold tongue, where the horizontal temperature gradient is large and there is a strong baroclinicity. At 850 hPa, there is a weak warm ridge over Qingdao at 1200 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">, which means that it is an inversion layer, which is conducive to the maintenance of fog.展开更多
氮素是植物生长发育所需的大量元素之一,施用氮肥是农业生产中提高农作物产量的重要手段。自20世纪60年代以来,“绿色革命”半矮秆农作物品种的育成和大面积推广有效地解决了“高产与倒伏”之间的矛盾,提高了农作物的收获指数和产量。...氮素是植物生长发育所需的大量元素之一,施用氮肥是农业生产中提高农作物产量的重要手段。自20世纪60年代以来,“绿色革命”半矮秆农作物品种的育成和大面积推广有效地解决了“高产与倒伏”之间的矛盾,提高了农作物的收获指数和产量。然而半矮秆水稻和小麦品种也表现出生长发育对氮肥响应减弱、根系对铵态氮和硝态氮的吸收能力下降以及氮肥利用效率(nitrogen use efficiency,NUE)低的弊病,其产量增加依赖于氮肥的大量投入,这不仅提高了种植成本还导致了严重的环境污染问题。因此,提高农作物氮肥利用效率对于保障国家粮食安全和农业可持续发展具有重要战略意义。本文概述了“绿色革命”与赤霉素的作用机理,系统总结了植物氮素吸收、同化和代谢调控方面的研究进展,并介绍了提高作物氮肥利用效率的最新研究发现,以期为作物氮肥高效利用的遗传改良提供参考。展开更多
The bimetallic NiCu/SAPO-11 catalysts were prepared by co-impregnation, sequential impregnation, coprecipitation, and mechanical mixing methods. Powder X-ray diffraction, nitrogen adsorption-desorption,temperature-pro...The bimetallic NiCu/SAPO-11 catalysts were prepared by co-impregnation, sequential impregnation, coprecipitation, and mechanical mixing methods. Powder X-ray diffraction, nitrogen adsorption-desorption,temperature-programmed desorption of ammonia, transmission electron microscopy, temperatureprogrammed reduction of hydrogen, and X-ray photoelectron spectroscopy were used to characterize the physicochemical properties of the catalysts. The catalytic performance of the catalysts was assessed by the hydroisomerization of n-octane. Results indicated that the conversion of n-octane and selectivity to n-octane isomers were related to the preparation methods of the catalysts. The catalysts with Ni-Cu alloy effectively restrained the hydrogenolysis reaction that decreases the selectivity of isomerization. The catalyst prepared by the mechanical mixing of NiO and CuO hardly formed Ni-Cu alloy, showing obvious hydrogenolysis and low selectivity to n-octane isomers. The unbalance between the metal and acid sites resulted in the low conversion of n-octane and selectivity to n-octane isomers. Among all the catalysts,the catalyst prepared by the co-impregnation method exhibited high catalytic activity and selectivity to n-octane isomers.展开更多
In this paper,the cyclic constitutive equations were proposed to describe the constitutive behavior of cyclic loading and unloading.Firstly,a coupled damage variable was derived,which contains two parts,i.e.,the compa...In this paper,the cyclic constitutive equations were proposed to describe the constitutive behavior of cyclic loading and unloading.Firstly,a coupled damage variable was derived,which contains two parts,i.e.,the compaction-induced damage and the cracking-induced damage.The compaction-induced damage variable was derived from a nonlinear stress–strain relation of the initial compaction stage,and the cracking-induced damage variable was established based on the statistical damage theory.Secondly,based on the total damage variable,a damage constitutive equation was proposed to describe the constitutive relation of rock under the monotonic uniaxial compression conditions,whereafter,the application of this model is extended to cyclic loading and unloading conditions.To validate the proposed monotonic and cyclic constitutive equations,a series of mechanical tests for marble specimens were carried out,which contained the monotonic uniaxial compression(MUC)experiment,cyclic uniaxial compression experiments under the variable amplitude(CUC-VA)and constant amplitude(CUC-CA)conditions.The results show that the proposed total damage variable comprehensively reflects the damage evolution characteristic,i.e.,the damage variable firstly decreases,then increases no matter under the conditions of MUC,CUC-VA or CUC-CA.Then a reasonable consistency is observed between the experimental and theoretical curves.The proposed cyclic constitutive equations can simulate the whole cyclic loading and unloading behaviors,such as the initial compaction,the strain hardening and the strain softening.Furthermore,the shapes of the theoretical curves are controlled by the modified coefficient,compaction sensitivity coefficient and two Weibull distributed parameters.展开更多
Naturally colored cotton fiber is environment-friendly but has monotonous color and poor fiber quality.Identification of green fiber or fuzz genes would aid in investigating the biosynthesis of green pigments in cotto...Naturally colored cotton fiber is environment-friendly but has monotonous color and poor fiber quality.Identification of green fiber or fuzz genes would aid in investigating the biosynthesis of green pigments in cotton fibers. In this study, we established a mapping population and found that the Lg^(f) trait(white lint and green fuzz) from Gossypium hirsutum race latifolium is controlled by an incompletely dominant gene.The Lg^(f) locus was mapped to a 71-kb interval on chromosome 21 containing seven genes, including a transcription factor with similarity to Arabidopsis MYB9. Harboring 13 SNPs and a 4-bp insertion/deletion in its promoter, GhMYB9 was highly up-regulated in the critical period for green pigment development in fuzz. Virus-induced gene silencing of GhMYB9 in a green-fuzz accession of G. hirsutum race latifolium TX-41 conferred white or light green fuzz. These results suggest that GhMYB9 is an important contributor to green pigments in cotton fiber and shed light on the regulatory mechanism controlling green pigmentation.展开更多
Zoonosis is an important factor affecting human economic development and population mortality. This paper introduces a general model of zoonosis, in which the diseases can only be transmitted from animals to humans, s...Zoonosis is an important factor affecting human economic development and population mortality. This paper introduces a general model of zoonosis, in which the diseases can only be transmitted from animals to humans, such as rabies, brucellosis and so on. The basic reproduction number R0 is derived. And then the global stability of the disease-free equilibrium and endemic equilibrium models is analyzed by using the method of comparison principle and Lyapunov function. Next, a numerical analysis is performed to elaborate the consistency of theoretical and numerical results and to prove the practical significance of zoonosis research. The numerical results show that our models are applicable to zoonosis with animal size larger than or smaller than population size. Finally, in order to see the most important factor for the epidemic of zoonosis a sensitive analysis is analyzed.展开更多
In this paper, we first study the linear regression model and obtain a norm-minimized estimator of the parameter vector by using the g-inverse and the singular value decomposition of matrix X. We then investigate the ...In this paper, we first study the linear regression model and obtain a norm-minimized estimator of the parameter vector by using the g-inverse and the singular value decomposition of matrix X. We then investigate the growth curve model (GCM) and extend the GCM to a generalized GCM (GGCM) by using high order tensors. The parameter estimations in GGCMs are also achieved in this way.展开更多
There is very little research on the perception and willingness of Chinese consumers to purchase organic wine.The research aims to understand the factors which influence Chinese consumers’willingness on organic wine ...There is very little research on the perception and willingness of Chinese consumers to purchase organic wine.The research aims to understand the factors which influence Chinese consumers’willingness on organic wine purchase.Based on the TRA and TPB,combine with SCT,a conceptual model is established to solve research problems.展开更多
Transition metal dichalcogenides(TMDCs)are promising candidates for future optoelectronic devices accounting for their high carrier mobility and excellent quantum efficiency.However,the limited light absorption effici...Transition metal dichalcogenides(TMDCs)are promising candidates for future optoelectronic devices accounting for their high carrier mobility and excellent quantum efficiency.However,the limited light absorption efficiency in atomically thin layers significantly hinders photocarrier generation,thereby impairing the optoelectronic performance and hindering practical applications.Herein,we successfully synthesized In_(2)Se_(3)/WSe_(2) heterostructures through a typical two-step chemical vapor deposition(CVD)method.The In_(2)Se_(3) nanosheet with strong light absorption capability,serving as the light absorption layer,was integrated with the monolayer WSe_(2),enhancing the photosensitivity of WSe_(2) significantly.Upon laser irradiation with a wavelength of 520 nm,the In_(2)Se_(3)/WSe_(2) heterostructure device shows an ultrahigh photoresponsivity with a value as high as 2333.5 A/W and a remarkable detectivity reaching up to 6.7×10^(12) Jones,which is the highest among almost the reported TMDCs-based heterostructures grown via CVD even some fabricated by mechanical exfoliation(ME).Combing the advantages of CVD method such as large scale,high yield,and clean interface,the In_(2)Se_(3)/WSe_(2) heterostructures would provide a novel path for future high-performance optoelectronic device.展开更多
2D materials are promising candidates as nonlinear optical components for on-chip devices due to their ultrathin structure. In general, their nonlinear optical responses are inherently weak due to the short interactio...2D materials are promising candidates as nonlinear optical components for on-chip devices due to their ultrathin structure. In general, their nonlinear optical responses are inherently weak due to the short interaction thickness with light. Recently, there has been great interest in using quasi-bound states in the continuum (q-BICs) of dielectric metasurfaces, which are able to achieve remarkable optical near-field enhancement for elevating the second harmonic generation (SHG) emission from 2D materials. However, most studies focus on the design of combining bulk dielectric metasurfaces with unpatterned 2D materials, which suffer considerable radiation loss and limit near-field enhancement by high-quality q-BIC resonances. Here, we investigate the dielectric metasurface evolution from bulk silicon to monolayer molybdenum disulfide (MoS2), and discover the critical role of meta-atom thickness design on enhancing near-field effects of two q-BIC modes. We further introduce the strongcoupling of the two q-BIC modes by oblique incidence manipulation, and enhance the localized optical field on monolayer MoS2dramatically. In the ultraviolet and visible regions, the MoS2SHG enhancement factor of our design is 105times higher than that of conventional bulk metasurfaces, leading to an extremely high nonlinear conversion efficiency of 5.8%. Our research will provide an important theoretical guide for the design of high-performance nonlinear devices based on 2D materials.展开更多
Obstructive sleep apnea syndrome(OSAS)is a common breathing disorder in sleep in which the airways narrow or collapse during sleep,causing obstructive sleep apnea.The prevalence of OSAS continues to rise worldwide,par...Obstructive sleep apnea syndrome(OSAS)is a common breathing disorder in sleep in which the airways narrow or collapse during sleep,causing obstructive sleep apnea.The prevalence of OSAS continues to rise worldwide,particularly in middle-aged and elderly individuals.The mechanism of upper airway collapse is incompletely understood but is associated with several factors,including obesity,craniofacial changes,altered muscle function in the upper airway,pharyngeal neuropathy,and fluid shifts to the neck.The main characteristics of OSAS are recurrent pauses in respiration,which lead to intermittent hypoxia(IH)and hypercapnia,accompanied by blood oxygen desaturation and arousal during sleep,which sharply increases the risk of several diseases.This paper first briefly describes the epidemiology,incidence,and pathophysiological mechanisms of OSAS.Next,the alterations in relevant signaling pathways induced by IH are systematically reviewed and discussed.For example,IH can induce gut microbiota(GM)dysbiosis,impair the intestinal barrier,and alter intestinal metabolites.These mechanisms ultimately lead to secondary oxidative stress,systemic inflammation,and sympathetic activation.We then summarize the effects of IH on disease pathogenesis,including cardiocerebrovascular disorders,neurological disorders,metabolic diseases,cancer,reproductive disorders,and COVID-19.Finally,different therapeutic strategies for OSAS caused by different causes are proposed.Multidisciplinary approaches and shared decision-making are necessary for the successful treatment of OSAS in the future,but more randomized controlled trials are needed for further evaluation to define what treatments are best for specific OSAS patients.展开更多
Intelligent responsive drug delivery system opens up new avenues for realizing safer and more effective combination immunotherapy.Herein,a kind of tumor cascade-targeted responsive liposome(NLG919@Lip-pep1)is develope...Intelligent responsive drug delivery system opens up new avenues for realizing safer and more effective combination immunotherapy.Herein,a kind of tumor cascade-targeted responsive liposome(NLG919@Lip-pep1)is developed by conjugating polypeptide inhibitor of PD-1 signal pathway(AUNP-12),which is also a targeted peptide that conjugated with liposome carrier through matrix metalloproteinase-2(MMP-2)cleavable peptide(GPLGVRGD).This targeted liposome is prepared through a mature preparation process,and indoleamine-2,3-dioxygenase(IDO)inhibitor NLG919 was encapsulated into it.Moreover,mediated by the enhanced permeability and retention effect(EPR effect)and AUNP-12,NLG919@Lip-pep1 first targets the cells that highly express PD-L1 in tumor tissues.At the same time,the over-expressed MMP-2 in the tumor site triggers the dissociation of AUNP-12,thus realizing the precise block of PD-1 signal pathway,and restoring the activity of T cells.The exposure of secondary targeting moduleⅡVRGDC-NLG919@Lip mediated tumor cells targeting,and further relieved the immunosuppressive microenvironment.Overall,this study offers a potentially appealing paradigm of a high efficiency,low toxicity,and simple intelligent responsive drug delivery system for targeted drug delivery in breast cancer,which can effectively rescue and activate the body's anti-tumor immune response and furthermore achieve effective treatment of metastatic breast cancer.展开更多
Pear is an important fruit tree that is widely distributed around the world.The first pear genome map was reported from our laboratory approximately 10 years ago.To further study global protein expression patterns in ...Pear is an important fruit tree that is widely distributed around the world.The first pear genome map was reported from our laboratory approximately 10 years ago.To further study global protein expression patterns in pear,we generated pear proteome data based on 24 major tissues.The tissue-resolved profiles provided evidence of the expression of 17953 proteins.We identified 4294 new coding events and improved the pear genome annotation via the proteogenomic strategy based on 18090 peptide spectra with peptide spectrum matches>1.Among the eight randomly selected new short coding open reading frames that were expressed in the style,four promoted and one inhibited the growth of pear pollen tubes.Based on gene coexpression module analysis,we explored the key genes associated with important agronomic traits,such as stone cell formation in fruits.The network regulating the synthesis of lignin,a major component of stone cells,was reconstructed,and receptor-like kinases were implicated as core factors in this regulatory network.Moreover,we constructed the online database PearEXP(http://www.peardb.org.cn)to enable access to the pear proteogenomic resources.This study provides a paradigm for in-depth proteogenomic studies of woody plants.展开更多
Rice is the staple food for nearly half of the world’s population.The negative correlation between rice yield and quality confers breeders a major challenge in how to improve these two traits synergistically.The grai...Rice is the staple food for nearly half of the world’s population.The negative correlation between rice yield and quality confers breeders a major challenge in how to improve these two traits synergistically.The grain shape,including grain length,grain width,and the ratio of grain length to width,plays an important role in determining rice yield potential and end-use quality.Thus far,some genes determining grain shape and appearance quality,such as GRAIN SIZE 3(GS3)(Fan et al.,2006),GRAIN WIDTH AND WEIGHT 5(GW5)(Liu et al.,2017),GRAIN WIDTH 8(GW8)(Wang et al.,2012),GRAIN SIZE 5(GS5)(Li et al.,2011),GRAIN LENGTH 7/GRAIN WIDTH 7(GL7/GW7)(Wang et al.,2015a,2015b),GRAIN LENGTH AND WEIGHT(GLW7)(Si et al.,2016),GRAIN LENGTH 4(GL4)(Wu et al.,2017),LONG GRAIN AND HIGH YIELD 3(LGY3)(Liu et al.,2018),GRAIN SIZE 9(GS9)(Zhao et al.,2018),GRAIN LENGTH 10(GL10)(Zhan et al.,2022),and BASIC LEUCINE ZIPPER 60(Osb-ZIP60)(Yang et al.,2022),have been cloned and characterized.However,only a few genes have been demonstrated to simultaneously improve grain yield and quality,and the underlying genetic interaction and network also remain largely unknown.展开更多
The Funding section in Ref.[1]originally reads as follows:Funding.Natural Science Foundation of Fujian Province(2020J06009);Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A15);National Safety Academi...The Funding section in Ref.[1]originally reads as follows:Funding.Natural Science Foundation of Fujian Province(2020J06009);Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A15);National Safety Academic Fund (U2130112);National Natural Science Foundation of China (62175205).展开更多
在农业生产中,大量施用氮肥是农作物增产的重要措施之一.在长达半个多世纪的农作物育种史上一直占据主导地位的'绿色革命'半矮化品种具有耐高肥、抗倒伏和高产的优良特性,但同时也存在氮肥利用效率(nitrogen use efficiency, N...在农业生产中,大量施用氮肥是农作物增产的重要措施之一.在长达半个多世纪的农作物育种史上一直占据主导地位的'绿色革命'半矮化品种具有耐高肥、抗倒伏和高产的优良特性,但同时也存在氮肥利用效率(nitrogen use efficiency, NUE)低的局限性,其高产量对于高水肥投入的依赖性很大.因此,为了提高农作物产量,不得不大量施用氮肥.但是,持续大量的氮肥投入不仅增加了种植成本,还导致了日益严重的环境污染问题.面临粮食安全和生态安全的双重挑战,协同提升农作物NUE和产量已成为可持续农业发展的唯一出路.结合我国粮食安全和农业可持续发展的迫切需求,本研究团队在植物生长发育与氮素代谢协同作用机制的研究以及氮肥高效利用的新种质培育方面取得了突破性进展.这项研究为'少投入、多产出、保护环境'的农作物设计育种提供了理论依据和技术支撑.本文简单介绍近年来NUE相关研究进展以及本研究团队在GRF4-DELLA分子模块协同调控农作物NUE和产量方面的新发现,并对该领域的未来研究方向提出几点展望.展开更多
文摘The visibility characteristics and meteorological conditions of a sea fog process on 27</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;"> February, 2016 are analyzed and the heavy fog process is simulated by the Weather Research and Forecasting (WRF) model in this paper. The forecast results show that the visibility in Qingdao coastal area is light fog on the night of the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">. In the WRF simulation, it can be observed from the sea-level pressure that the wind direction of Qingdao and the coastal area turned southerly with the eastward movement of the low pressure system on surface from 1200 UTC to 1800 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">. A large amount of water vapor brought by easterly and southerly wind provides sufficient water vapor conditions for the formation and development of the sea fog. At 975 hPa, there is a strong warm tongue over Shandong Peninsula at 0600 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">, w</span><span><span style="font-family:Verdana;">hile the offshore is affected by the cold tongue, where the horizontal temperature gradient is large and there is a strong baroclinicity. At 850 hPa, there is a weak warm ridge over Qingdao at 1200 UTC on the 26</span><sup><span style="font-family:Verdana;">th</span></sup><span style="font-family:Verdana;">, which means that it is an inversion layer, which is conducive to the maintenance of fog.
文摘氮素是植物生长发育所需的大量元素之一,施用氮肥是农业生产中提高农作物产量的重要手段。自20世纪60年代以来,“绿色革命”半矮秆农作物品种的育成和大面积推广有效地解决了“高产与倒伏”之间的矛盾,提高了农作物的收获指数和产量。然而半矮秆水稻和小麦品种也表现出生长发育对氮肥响应减弱、根系对铵态氮和硝态氮的吸收能力下降以及氮肥利用效率(nitrogen use efficiency,NUE)低的弊病,其产量增加依赖于氮肥的大量投入,这不仅提高了种植成本还导致了严重的环境污染问题。因此,提高农作物氮肥利用效率对于保障国家粮食安全和农业可持续发展具有重要战略意义。本文概述了“绿色革命”与赤霉素的作用机理,系统总结了植物氮素吸收、同化和代谢调控方面的研究进展,并介绍了提高作物氮肥利用效率的最新研究发现,以期为作物氮肥高效利用的遗传改良提供参考。
基金supported by the National Natural Science Foundation of China (No. 21676300)
文摘The bimetallic NiCu/SAPO-11 catalysts were prepared by co-impregnation, sequential impregnation, coprecipitation, and mechanical mixing methods. Powder X-ray diffraction, nitrogen adsorption-desorption,temperature-programmed desorption of ammonia, transmission electron microscopy, temperatureprogrammed reduction of hydrogen, and X-ray photoelectron spectroscopy were used to characterize the physicochemical properties of the catalysts. The catalytic performance of the catalysts was assessed by the hydroisomerization of n-octane. Results indicated that the conversion of n-octane and selectivity to n-octane isomers were related to the preparation methods of the catalysts. The catalysts with Ni-Cu alloy effectively restrained the hydrogenolysis reaction that decreases the selectivity of isomerization. The catalyst prepared by the mechanical mixing of NiO and CuO hardly formed Ni-Cu alloy, showing obvious hydrogenolysis and low selectivity to n-octane isomers. The unbalance between the metal and acid sites resulted in the low conversion of n-octane and selectivity to n-octane isomers. Among all the catalysts,the catalyst prepared by the co-impregnation method exhibited high catalytic activity and selectivity to n-octane isomers.
基金This study was financially supported by the National Natural Science Foundation of China(Nos.51978292,42077254 and 51874144).
文摘In this paper,the cyclic constitutive equations were proposed to describe the constitutive behavior of cyclic loading and unloading.Firstly,a coupled damage variable was derived,which contains two parts,i.e.,the compaction-induced damage and the cracking-induced damage.The compaction-induced damage variable was derived from a nonlinear stress–strain relation of the initial compaction stage,and the cracking-induced damage variable was established based on the statistical damage theory.Secondly,based on the total damage variable,a damage constitutive equation was proposed to describe the constitutive relation of rock under the monotonic uniaxial compression conditions,whereafter,the application of this model is extended to cyclic loading and unloading conditions.To validate the proposed monotonic and cyclic constitutive equations,a series of mechanical tests for marble specimens were carried out,which contained the monotonic uniaxial compression(MUC)experiment,cyclic uniaxial compression experiments under the variable amplitude(CUC-VA)and constant amplitude(CUC-CA)conditions.The results show that the proposed total damage variable comprehensively reflects the damage evolution characteristic,i.e.,the damage variable firstly decreases,then increases no matter under the conditions of MUC,CUC-VA or CUC-CA.Then a reasonable consistency is observed between the experimental and theoretical curves.The proposed cyclic constitutive equations can simulate the whole cyclic loading and unloading behaviors,such as the initial compaction,the strain hardening and the strain softening.Furthermore,the shapes of the theoretical curves are controlled by the modified coefficient,compaction sensitivity coefficient and two Weibull distributed parameters.
基金supported by the Genetically Modified Organisms Breeding Major Project of China(2016ZX08005005-001)the National Natural Science Foundation of China(31701471)the Fundamental Research Funds for the Central Universities(SWU118093)。
文摘Naturally colored cotton fiber is environment-friendly but has monotonous color and poor fiber quality.Identification of green fiber or fuzz genes would aid in investigating the biosynthesis of green pigments in cotton fibers. In this study, we established a mapping population and found that the Lg^(f) trait(white lint and green fuzz) from Gossypium hirsutum race latifolium is controlled by an incompletely dominant gene.The Lg^(f) locus was mapped to a 71-kb interval on chromosome 21 containing seven genes, including a transcription factor with similarity to Arabidopsis MYB9. Harboring 13 SNPs and a 4-bp insertion/deletion in its promoter, GhMYB9 was highly up-regulated in the critical period for green pigment development in fuzz. Virus-induced gene silencing of GhMYB9 in a green-fuzz accession of G. hirsutum race latifolium TX-41 conferred white or light green fuzz. These results suggest that GhMYB9 is an important contributor to green pigments in cotton fiber and shed light on the regulatory mechanism controlling green pigmentation.
文摘Zoonosis is an important factor affecting human economic development and population mortality. This paper introduces a general model of zoonosis, in which the diseases can only be transmitted from animals to humans, such as rabies, brucellosis and so on. The basic reproduction number R0 is derived. And then the global stability of the disease-free equilibrium and endemic equilibrium models is analyzed by using the method of comparison principle and Lyapunov function. Next, a numerical analysis is performed to elaborate the consistency of theoretical and numerical results and to prove the practical significance of zoonosis research. The numerical results show that our models are applicable to zoonosis with animal size larger than or smaller than population size. Finally, in order to see the most important factor for the epidemic of zoonosis a sensitive analysis is analyzed.
文摘In this paper, we first study the linear regression model and obtain a norm-minimized estimator of the parameter vector by using the g-inverse and the singular value decomposition of matrix X. We then investigate the growth curve model (GCM) and extend the GCM to a generalized GCM (GGCM) by using high order tensors. The parameter estimations in GGCMs are also achieved in this way.
文摘There is very little research on the perception and willingness of Chinese consumers to purchase organic wine.The research aims to understand the factors which influence Chinese consumers’willingness on organic wine purchase.Based on the TRA and TPB,combine with SCT,a conceptual model is established to solve research problems.
基金support from the following funding:the National Key R&D Program of China(No.2022YFA1204300)the National Natural Science Foundation of China(Nos.62104066,52221001,62090035,U19A2090,U22A20138 and 51902098)+5 种基金the Natural Science Foundation of Hunan Province(No.2021JJ20016)the Science and Technology Innovation Program of Hunan Province(Nos.2021RC3061 and 2020RC2028)the Key Program of Science and Technology Department of Hunan Province(Nos.2019XK2001 and 2020XK2001)the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2020WNLOKF016)the National Postdoctoral Program for Innovative Talents(No.BX2021094)the Postdoctoral Science Foundation of China(No.2020M680112).
文摘Transition metal dichalcogenides(TMDCs)are promising candidates for future optoelectronic devices accounting for their high carrier mobility and excellent quantum efficiency.However,the limited light absorption efficiency in atomically thin layers significantly hinders photocarrier generation,thereby impairing the optoelectronic performance and hindering practical applications.Herein,we successfully synthesized In_(2)Se_(3)/WSe_(2) heterostructures through a typical two-step chemical vapor deposition(CVD)method.The In_(2)Se_(3) nanosheet with strong light absorption capability,serving as the light absorption layer,was integrated with the monolayer WSe_(2),enhancing the photosensitivity of WSe_(2) significantly.Upon laser irradiation with a wavelength of 520 nm,the In_(2)Se_(3)/WSe_(2) heterostructure device shows an ultrahigh photoresponsivity with a value as high as 2333.5 A/W and a remarkable detectivity reaching up to 6.7×10^(12) Jones,which is the highest among almost the reported TMDCs-based heterostructures grown via CVD even some fabricated by mechanical exfoliation(ME).Combing the advantages of CVD method such as large scale,high yield,and clean interface,the In_(2)Se_(3)/WSe_(2) heterostructures would provide a novel path for future high-performance optoelectronic device.
基金National Safety Academy Foundation(U1830116, U2130112)National Natural Science Foundation of China (62175205)+2 种基金Youth Talent Support Program of Fujian Province (Eyas Plan of Fujian Province)([2022])Shenzhen Science and Technology Innovation Program (JCYJ20220530143015035)Agency for Science,Technology and Research (A20E5c0093, C210112019,C230917001, M21K2c0116, M22K2c0088, NRF2021-QEP2-03-P09)。
文摘2D materials are promising candidates as nonlinear optical components for on-chip devices due to their ultrathin structure. In general, their nonlinear optical responses are inherently weak due to the short interaction thickness with light. Recently, there has been great interest in using quasi-bound states in the continuum (q-BICs) of dielectric metasurfaces, which are able to achieve remarkable optical near-field enhancement for elevating the second harmonic generation (SHG) emission from 2D materials. However, most studies focus on the design of combining bulk dielectric metasurfaces with unpatterned 2D materials, which suffer considerable radiation loss and limit near-field enhancement by high-quality q-BIC resonances. Here, we investigate the dielectric metasurface evolution from bulk silicon to monolayer molybdenum disulfide (MoS2), and discover the critical role of meta-atom thickness design on enhancing near-field effects of two q-BIC modes. We further introduce the strongcoupling of the two q-BIC modes by oblique incidence manipulation, and enhance the localized optical field on monolayer MoS2dramatically. In the ultraviolet and visible regions, the MoS2SHG enhancement factor of our design is 105times higher than that of conventional bulk metasurfaces, leading to an extremely high nonlinear conversion efficiency of 5.8%. Our research will provide an important theoretical guide for the design of high-performance nonlinear devices based on 2D materials.
基金supported by the National Natural Science Foundation of China(Grant No.82000771)Shandong Provincial Natural Science Foundation(Grant No.ZR2021MH014)+1 种基金Jinan Municipal Science and Technology Project(Grant No.202134033)Shandong Provincial Youth Innovation Team Development Plan of Colleges and Universities(2022KJ193).
文摘Obstructive sleep apnea syndrome(OSAS)is a common breathing disorder in sleep in which the airways narrow or collapse during sleep,causing obstructive sleep apnea.The prevalence of OSAS continues to rise worldwide,particularly in middle-aged and elderly individuals.The mechanism of upper airway collapse is incompletely understood but is associated with several factors,including obesity,craniofacial changes,altered muscle function in the upper airway,pharyngeal neuropathy,and fluid shifts to the neck.The main characteristics of OSAS are recurrent pauses in respiration,which lead to intermittent hypoxia(IH)and hypercapnia,accompanied by blood oxygen desaturation and arousal during sleep,which sharply increases the risk of several diseases.This paper first briefly describes the epidemiology,incidence,and pathophysiological mechanisms of OSAS.Next,the alterations in relevant signaling pathways induced by IH are systematically reviewed and discussed.For example,IH can induce gut microbiota(GM)dysbiosis,impair the intestinal barrier,and alter intestinal metabolites.These mechanisms ultimately lead to secondary oxidative stress,systemic inflammation,and sympathetic activation.We then summarize the effects of IH on disease pathogenesis,including cardiocerebrovascular disorders,neurological disorders,metabolic diseases,cancer,reproductive disorders,and COVID-19.Finally,different therapeutic strategies for OSAS caused by different causes are proposed.Multidisciplinary approaches and shared decision-making are necessary for the successful treatment of OSAS in the future,but more randomized controlled trials are needed for further evaluation to define what treatments are best for specific OSAS patients.
基金the National Natural Science Foundation of China(82173762,China)111 Project(B18035,China)+2 种基金the Fundamental of Research Funds for the Central Universities(China)the Key Research and Development Program of Science and Technology Department of Sichuan Province(2022JDJQ0050,China)Project of Chengdu Science and Technology Bureau(2020-GH03-00003-HZ)。
文摘Intelligent responsive drug delivery system opens up new avenues for realizing safer and more effective combination immunotherapy.Herein,a kind of tumor cascade-targeted responsive liposome(NLG919@Lip-pep1)is developed by conjugating polypeptide inhibitor of PD-1 signal pathway(AUNP-12),which is also a targeted peptide that conjugated with liposome carrier through matrix metalloproteinase-2(MMP-2)cleavable peptide(GPLGVRGD).This targeted liposome is prepared through a mature preparation process,and indoleamine-2,3-dioxygenase(IDO)inhibitor NLG919 was encapsulated into it.Moreover,mediated by the enhanced permeability and retention effect(EPR effect)and AUNP-12,NLG919@Lip-pep1 first targets the cells that highly express PD-L1 in tumor tissues.At the same time,the over-expressed MMP-2 in the tumor site triggers the dissociation of AUNP-12,thus realizing the precise block of PD-1 signal pathway,and restoring the activity of T cells.The exposure of secondary targeting moduleⅡVRGDC-NLG919@Lip mediated tumor cells targeting,and further relieved the immunosuppressive microenvironment.Overall,this study offers a potentially appealing paradigm of a high efficiency,low toxicity,and simple intelligent responsive drug delivery system for targeted drug delivery in breast cancer,which can effectively rescue and activate the body's anti-tumor immune response and furthermore achieve effective treatment of metastatic breast cancer.
基金funded by the National Key Research and Development Program of China(2022YFF1003100-02,2020YFE0202900)the National Natural Science Foundation of China(32172543,31830081,22274130,32202411)+5 种基金Fundamental Research Funds for the Central Universities(JCQY201901,KYZ201888)Jiangsu Agriculture Science and Technology Innovation Fund(CX(19)2028)the seed industry promotion project of Jiangsu(JBGS(2021)022)the guidance foundation of Hainan Institute of Nanjing Agricultural University(NAUSY-MS08)the Earmarked Fund for China Agriculture Research System(CARS-28)the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Pear is an important fruit tree that is widely distributed around the world.The first pear genome map was reported from our laboratory approximately 10 years ago.To further study global protein expression patterns in pear,we generated pear proteome data based on 24 major tissues.The tissue-resolved profiles provided evidence of the expression of 17953 proteins.We identified 4294 new coding events and improved the pear genome annotation via the proteogenomic strategy based on 18090 peptide spectra with peptide spectrum matches>1.Among the eight randomly selected new short coding open reading frames that were expressed in the style,four promoted and one inhibited the growth of pear pollen tubes.Based on gene coexpression module analysis,we explored the key genes associated with important agronomic traits,such as stone cell formation in fruits.The network regulating the synthesis of lignin,a major component of stone cells,was reconstructed,and receptor-like kinases were implicated as core factors in this regulatory network.Moreover,we constructed the online database PearEXP(http://www.peardb.org.cn)to enable access to the pear proteogenomic resources.This study provides a paradigm for in-depth proteogenomic studies of woody plants.
基金the National Key Research and Development Program of China(2022YFF1002900)the National Natural Science Foundation of China(31971916,31701332,32172015)+1 种基金the Youth Innovation Promotion Association,Chinese Academy of Sciences(2019-100)the Postdoctoral Science Foundation of China(2018T110152).
文摘Rice is the staple food for nearly half of the world’s population.The negative correlation between rice yield and quality confers breeders a major challenge in how to improve these two traits synergistically.The grain shape,including grain length,grain width,and the ratio of grain length to width,plays an important role in determining rice yield potential and end-use quality.Thus far,some genes determining grain shape and appearance quality,such as GRAIN SIZE 3(GS3)(Fan et al.,2006),GRAIN WIDTH AND WEIGHT 5(GW5)(Liu et al.,2017),GRAIN WIDTH 8(GW8)(Wang et al.,2012),GRAIN SIZE 5(GS5)(Li et al.,2011),GRAIN LENGTH 7/GRAIN WIDTH 7(GL7/GW7)(Wang et al.,2015a,2015b),GRAIN LENGTH AND WEIGHT(GLW7)(Si et al.,2016),GRAIN LENGTH 4(GL4)(Wu et al.,2017),LONG GRAIN AND HIGH YIELD 3(LGY3)(Liu et al.,2018),GRAIN SIZE 9(GS9)(Zhao et al.,2018),GRAIN LENGTH 10(GL10)(Zhan et al.,2022),and BASIC LEUCINE ZIPPER 60(Osb-ZIP60)(Yang et al.,2022),have been cloned and characterized.However,only a few genes have been demonstrated to simultaneously improve grain yield and quality,and the underlying genetic interaction and network also remain largely unknown.
文摘The Funding section in Ref.[1]originally reads as follows:Funding.Natural Science Foundation of Fujian Province(2020J06009);Open Fund of State Key Laboratory of Applied Optics (SKLAO2020001A15);National Safety Academic Fund (U2130112);National Natural Science Foundation of China (62175205).
文摘在农业生产中,大量施用氮肥是农作物增产的重要措施之一.在长达半个多世纪的农作物育种史上一直占据主导地位的'绿色革命'半矮化品种具有耐高肥、抗倒伏和高产的优良特性,但同时也存在氮肥利用效率(nitrogen use efficiency, NUE)低的局限性,其高产量对于高水肥投入的依赖性很大.因此,为了提高农作物产量,不得不大量施用氮肥.但是,持续大量的氮肥投入不仅增加了种植成本,还导致了日益严重的环境污染问题.面临粮食安全和生态安全的双重挑战,协同提升农作物NUE和产量已成为可持续农业发展的唯一出路.结合我国粮食安全和农业可持续发展的迫切需求,本研究团队在植物生长发育与氮素代谢协同作用机制的研究以及氮肥高效利用的新种质培育方面取得了突破性进展.这项研究为'少投入、多产出、保护环境'的农作物设计育种提供了理论依据和技术支撑.本文简单介绍近年来NUE相关研究进展以及本研究团队在GRF4-DELLA分子模块协同调控农作物NUE和产量方面的新发现,并对该领域的未来研究方向提出几点展望.